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0. A. COLBY.

ELECTRIC FURNAGE FOR HEATING RIBBONS AND BARS.

APPLICATION FILED SEPT. 16, I9l8. 1,347,895. Patented July 2 1920.

Fig 2.

l Il//f 1:///,// I/ l/ I 1 mvENToR Ura A. Colby.

WIT SSES t itI UNITED I arl'ufi'rils PAT-ENT OFFICE-4 AssieNoa 'ro WSTINGHOUSE anno-n :raro agiiianracrimre cio'iimii'nr,= A Aoon,rgonteirloir Ior PEmtsirinfamia.`

` 1"matarme FURNACE Foa HEATING RIBBONS AND BARS.

Leiigsos.

To Vall iv/iom t may concern.' .-1 'Be it 4'known tliatl, GRA A.- CoLY, a `citizenof the'United States, and a resident -of ALarimer, 'in the' county off Westmoreland Vand State of Pennsylvania, have' invented a newan'd useful Improvement 1n` Electrlc Furnaces 'for Heating Ribbons`-and Bars, ofv

which the followinv 1s a. specification.

lifyinientionreates' to' electric furnaces Ewhich are einployed for. `continuously heating-bars and ribbonsj that are'fed to 'automatic forging'mechanisins, and'it lhas for its obje/otto provide rfrieans whereby heat sup-1 plied' to lthe'bhrs or lrilfboiis in4 the-proporltion'sdem:ii'irirlerl byth'eyarying temperatures ofsu'ch bars'bfr ribbonsat the'variousp'oints in their' paths of movement' through the heatin chamber of the electric furnace` "In i 4ectric fu'rnacesof the character above "designated, it i desirable to--liavel means associated with the'furnace' wherebythe bar or ribbon shallbe's'upplied with more heat at the point of entrance tothe furnacethan at the point of cxitther'efrombecauseof the fact that 'the metal serves to'cool the zone at the entrance of the 'heating charnber to a greater degree than 'it does at other points farther along in its path of movement.

Another object o f'iny invention is to pro vide heating means for such bars which will be conipactliy contained,and,at the-same time, will permit the heating elements to be easily removable for purposes of repair or substitution.

For a better understanding of my invention, reference inay behad tol panying drawing inzwhich:

Figure 'l is a horizontal, sectional View, taken on line IeI of Fig. 2, of a furnace constructed in accordance With'my invention, and Fig. 2 is a vertical sectional View taken online ll-llof Fig. 1.

Referring morev particularly to the drawing, the furnace is shown as comprising a body portion l supported on standards 2 and 3. Extending lengthwise through the furnace, is a passage 4-which is inclosed on all sides, the ceilin of the same consisting of a plurality of silicon carbid resistors 5.

The resistors 5 are supported on two rows of silicon carbid blocks 6-.-6 which constitute the side walls of the passa e 4. The main portion of the furnace bo y is composed of blocks the accomf f appncaguon'aie e'pteeiher 'isjlalaf `serial N. 254,22'1:

't' of-- refractory material, y

`iA i Specification of Letters Patent. Patented July 27, 1920ij and is provided with two wells 8-8 that-are 5 filled `with granularconducting material"to` constitute conducting .members 'between the' resistors 5 and "terminals 9 9'. "h

"Referring 4now to Fig.` 1, it will be`ob` served that the row ofresistotr's' is brtfllin '6o at a point between'vtheentryj'and exitl'ends of thechamber 4 bg' a w'all 'of fire-,brick 1,0,

'sections' off trans'- and that "separzite` y i versch-extending' 'fr 'sister bloeks"are ysupplied with current constitutes the exit 'endiwfor si'rch'imetallic bars or ribbons 'as' it-.i's'desi'red to heat. l"

'Havinginowjdescribed` al' furnace 'conystructed 1n acciordancewithJ yfinifention,` the operation thereoflis' as' follows :l

. Thebai' or ribbon to be lheated is fed into temperature throughout the -en 1re lengthof heating chamber, a'condition which promotes eiiicient operation of the heating element ywhich overlies theftreatingchamber.

Moreover, it will,l be observed'ftrhat, since the wells 8 8 are filled withfgranlar'mate- 90 rial, renewal of this portion of the eonducty ing path between the terniinal's'and'the resistors is a matter of little diiulty. ffgainv, the interior portions of the'terininals are kept covered and out of IContact with the air, thereby preventing deterioration `ofthe same.

Moreox-'eigjn a furnace in which the terminals are disposed as herein illustrated,

of current than the 80 they are located a considerable distance'loo from the hottest portion of the furnace, namely, the resistors 5.' In addition, they are positioned in this manner in order that repairs may be easil made thereto by the re bricks. Again, the location of the resistor 5 in intimate contact with the material in the ifmfple expedient of ifting oif the top row two wle-lis. and ,transyersely across the heat@ mfr chamber insures a minimum amountof turbances j v The disposition of the ress'to above the heating chamber is alsoimportant because the bar or ribbon would be chemiotherwise,

reason oi contact with callyT acted upon by @Sist/OBJ.- il

While I have desciibedbut oneembodi-- ment of my invention, "itis apparent that many modifications therein may occur to tliosefsfkilled in the Vart andl desire, therehat only 'such limitations shall be fore,

placed 'thereon as are imposed by the scope o f lthe prior art or are specifically set forth in` the" appeiided claims. l

to another' portion thereof.

chamber .ma 1

than

prisin transvejrs'ely with I' cla'inr as my 'in'ventionz 1. lrfanelectri'c furnace, theoombination with a heating chamber, of a 'resistor form- 'roof yof said chamber,'supporting' 4 ing the means ass'ocited with said resistor to prof vide saft, laf

another,

`2. nfaii electric-furnace, l the combination witliaheati lying Sadfhinber, ciate d" `\s`r'th said resistor to provide, said chamber, of a resistor overheating' cfa -`beiiwith a rectangular'cross-- tially of `electr1cal conducting material whereby threeV sides of said recta ular cross-sectioiia1-chamber may be`ut`iliz forA heat e1n`issio"n,' `an'd` means whereby said be made hotter' aty one portion al'' l,n0t`.i. f 3. In an electric `furnace, the combination with fa'heatingfhamber, of a resistor constitutiii fthe top of said chamber, terminal thermal insulating,

granular conducting material interposed between said resistor and said electrodes, and Q iyliereby more current may be supplied to ione portlon of said resistor than electro es,

4. In en electric furnace, the combination with a' continuous heating chamber, of a discontinuousresistor forming the roof of said chamber said overlying resistor-,com-

"a p urality of bricks varran ed respect to said heating chamber, said resistor being adapted to be arcing anlother undesirable electric dis-v cable length; nain supporting means `assovother.

5. In an electric furnace, the combination {Stor-overrality of,conductin Tbl, ksfextending across the mp ofa g of heaftlng'vohamber, supporting means 'associated with said reslstor 'blecksso'arran ed that said chamber? is in the form oa pgglike essa e of apprees, granular tinua lene- 011z aidsfsib 'bein adaiisie heat-,thn'vo'h 7 In ,an le'cfile futile .wie @aan j @gehe met@ .was 4 91' @edf @omeosm e rlwsehtynotiwerecheg-blocks Slee all ,igotioynffW/@llsf-Sol'aagd that sind chef. @'YS, f Qtholm .ef-a. box-like .Passage 0i, appreciab el enigth,. said`1 resistor being in two, portionsrth t portion ofl the resistor overlyin the entrance'pt l lsaid chamber being dap edtoradiate more heatthan that portion adj'acentfthe In an furnace, the combination with 4a continuous heatmgzohamber, of `a d1scontuiuous1resistor ,Vorming the roof of said chamber, da souroefpf .energy supply 4for fthe diinhination said furnace, that portion of said resistor adjacent the entraneeofsaiid heating chamber being` adapt`c l,to deriy'e more current from said source o l'energy' supply than that portion acent thefeiiit of said chamber.

In t estiinony wherecf, have hereunto subcrlbed my l iialr'le this 30th day of Aug.,

i I i l y 'om A; coLBY;

made hotter 4than 'co ra' "lu-4 emerito; resiste: ffm-y 

